Accelerator for vulcanization processes



Patented Augi23, 1932 i i UNITED STATES PATENT OFFICE.

WILHELM LOMMEL, F WIESDORF-ON-THIl-RHINE, THEODOR (300855, 0]? LEVEBlKUSEN ON-THE-RHINE, AND HERMANN FRIEDRICH, OF WIESDOBF-ON- THE-RHINE, GER- MANY, ASSIGNORS TO I. G. FARBENINDUSTBIE AKTIENGESELLSGHAFT, OF FRANK- FORT-ON-THE-MAIN, GANY 1% Drawing. Application filed September 5, 1930, Serial No. 480,019, and in Germany November 8, 1927.

The present invention relates to a process of vulcanizing rubber. compounds and consists in efiecting the vulcanization in the presence of an accelerator of the probable 5 formula for example, by rolling or kneading within the rubber compounds to be vulcanized together with or apart from the other ingredients usually employed in vulcanization processes, such as sulfur, selenium, aromatic nitro compounds plus metal oxides or other vulcanizing agents, fillers, plasticizing p agents, pigments, etc vulcanization of the I mixtures thus produced is performed by heating with or without the application of superatmospheric pressure advantageously to temperatures between a out 100150 C.

- It may be mentioned that the term rubber compound is intended to include natural rubber varieties and artificial rubber like masses obtainable by polymerizing a rubber forming hydrocarbon, such as butadiene- (1.3) or homologues or analogues thereof alone or in admixture with other suitable compounds capable of being polymerized, such as styrol, vinylnaphthalenes, etc. 0b- 40 viously, instead of a single one of our new vulcanization accelerators, mixtures of two or more of the same may be employed and, if desired, acclerators of another type may be used simultaneously. This application is a continuation in part Ewample 1 100 parts of a rubber like mass obtained by polymerizing butadiene-(L3) in the presence of sodium metal parts of lamp black 15 parts of zinc white parts of a mixture of equal parts of colophony and pine tar 2 parts of stearic acid 1 part of sulfur, and 1.8 parts of di- (thio-methyl-cyclohexylamine) are mixed by rolling or kneading and the Q5 mixture is vulcanized at a steam pressure of t atmospheres (about 150 C.) for 60 minutes. The vulcanizate thus obtainable shows a tensile strength of 197 kg/sqcmat a stretch of 605%. m

y Example 9 100 parts of a rubber like mass obtained by polymerizing butadiene-(LS) in the presence of sodium metal 60 parts of lamp black 15 parts of zinc white a 4 parts of a mixture of equal parts of 0010- phony and pine tar 2 parts of stearic acid m 1 part of sulfur, and 1.8 parts of di- (thio ethyl cyclo hexylamine) v are mixed by rolling or kneading and the mixture is vulcanized at a steam pressure of 4 atmospheres (about C.) for 80 min-' utes. The vulcanizate thus obtainable shows a tensile strength of 193 kg/sqcm at a stretch of 600%.

Ewample 8 100 parts of a rubber like mass obtained by polymerizing butadiene-(L3) in the presence of sodium metal 60 parts of lamp black L15 parts of zinc white Y 4 parts of a mixture of equal parts of colophony and pine tar 2 parts of stearic acid 1 part of sulfur, and

1.8 parts of di-(N-thio-dekahydro-quinaldine) of'the formula:

are mixed by rolling or kneading and the mixture is vulcanized at a steam pressure of 4.- atmospheres (about 150 C.) for 40 minutes. The vulcanizate thus obtainable shows a tensile strength of 200 kg/sqcm at a stretch of 705%.

Eimmple 4 100 parts of smoked sheets 5 parts of zinc oxide 3.5 parts of sulfur, and 1 part of di-(thio-cyclohexyl-methylamine) We claim 1. Process for the manufacture of vulcanized rubber compounds whichconsists in effecting the vulcanization in the presence of a compound of the probable formula:

wherein R means a cyclohexyl group and R stands for a hydrocarbon radical, which may be linked up with R to form a ring configurat1on.

2.- Process'for the manufacture of vulcanized rubber compounds which consists in effecting the vulcanization in the presence of a compound of the probable formula:

wherein R means a cyclohexyl group and R stands for an alkyl group, which may be linked up with R to form a ring configura- 3. Process for the manufacture of vulcanized rubber compounds which consists in effecting the vulcanization in the presence of a compound of the probable formula:

H: H: H1 H2 H I} Q H H1 H: a v a a +8- om/ oim 4. Process for the manufacture of vulcan- Ill! ized rubber compounds which consists in effecting the vulcanization in the presence of a compound of the probable formula:

5. As new products of manufacture, vulcanized rubber compounds obtainable. accord ing to claim 1. I

6..As new-products of manufacture, W19 canized rubber compounds obtainable according to claim 2. v

HaHa

III

7. As new products of manufacture, vulcanized rubber compounds obtainable according to claim 3.

8. As new products of manufacture, vulcanized rubber compounds obtainable according to claim 4.

In 'testimony whereof, we afiix our signs.-

tures. 

